Tribulus terrestris
SupplementThe 20-point discrepancy arises because clinical research does not demonstrate consistent testosterone elevation in humans [s1, s2], while community reports frequently describe subjective libido improvements [c1, c2]. Placebo effects and variations in protodioscin content of commercial products may explain the higher user satisfaction [s3, c3].
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TL;DR
Tribulus terrestris has no robust clinical evidence for testosterone elevation in humans despite decades of popularity in bodybuilding circles — a 2025 systematic review confirms this. Subjective libido improvements are reported by some users, likely mediated through nitric oxide pathways rather than testosterone. Rare but serious risks (hepato- and nephrotoxicity) are documented in case reports and shouldn't be dismissed at high doses or with prolonged use. Those seeking libido support are likely better served by Tongkat Ali (stronger evidence) or ashwagandha.
Description
Plant-based supplement derived from Tribulus terrestris containing steroidal saponins (protodioscin), traditionally used to enhance libido and sexual function; clinical evidence for testosterone incr...
Tribulus terrestris (puncture vine) is a globally distributed plant whose fruits, roots, and leaves have traditionally been used in Ayurvedic and European folk medicine as an aphrodisiac, tonic, and treatment for urinary tract conditions [s3]. The primary biologically active constituents are steroidal saponins, particularly protodioscin, diosgenin, and tribulosin, supplemented by flavonoids, tannins, terpenoids, and phenolic acids [s3]. In animal studies and in vitro experiments, protodioscin has been shown to increase testosterone, dihydrotestosterone (DHT), DHEA, and luteinizing hormone (LH), as well as stimulate nitric oxide release in corpus cavernosum tissue [s4, s5]. These findings have not been consistently reproduced in clinical human studies [s1, s2]. Multiple RCTs have investigated its use in erectile dysfunction (ED), libido disorders in men and women, and postmenopausal sexual dysfunction [s6, s7, s8]. A current systematic review concludes that evidence for improvement of erectile function is weak and no robust evidence for testosterone elevation in humans exists [s1]. RCTs also showed no significant advantage over placebo for athletic performance or muscle hypertrophy [s9, s10]. Safety concerns include rare but documented cases of hepato- and nephrotoxicity in case reports [s14, s15]. The BfR has classified Tribulus terrestris as a priority substance requiring regulatory action [s12]. Long-term safety data are largely absent.
Legal Status (DE)
{'wada_status': 'Tribulus terrestris and protodioscin are not listed on the 2025 WADA Prohibited List and are therefore not banned for competitive athletes [s18]. DHEA, which can arise through protodioscin metabolism, is however prohibited by WADA as an anabolic androgen (prasterone) [s18]. ', 'wada_source_ids': ['s18']}
Mechanism of Action
The postulated primary mechanism of action is based on the steroidal saponin protodioscin. Animal models have demonstrated that protodioscin stimulates the hypothalamic-pituitary axis, whereby increased LH and FSH secretion stimulates Leydig cells to produce testosterone [s5, s11]. Additionally, protodioscin stimulates nitric oxide (NO) release in corpus cavernosum tissue, which may contribute to enhanced vasodilation and improved erectile function [s4]. Elevated levels of testosterone, DHT, and DHEA following protodioscin administration have been observed in animal experiments [s4, s5]. These hormonal effects could not be consistently demonstrated in controlled human studies [s1, s2]. One possible explanation is that protodioscin content varies considerably depending on plant part and geographical origin, and may be insufficiently concentrated in many commercial products [s3, s11]. A phosphodiesterase-inhibiting effect is discussed as an alternative mechanism, which could promote NO-mediated vasodilation independently of testosterone levels [s4].
Dosing
Libido und Sexualfunktion (Männer)
- Dose
- 750–1500 mg dry extract (standardized to 40–60% saponins)
- Frequency
- 2–3× täglich
- Route
- oral
- Duration
- 4–12 Wochen
- Timing
- With meals
- With food
- empfohlen
Sexualfunktion (Frauen, postmenopausal)
- Dose
- 750 mg dry extract daily
- Frequency
- 1× täglich
- Route
- oral
- Duration
- 4 Wochen
- Timing
- With a main meal
- With food
- empfohlen
Libido bei Frauen in den fruchtbaren Jahren
- Dose
- 7.5 mg/kg body weight dry extract daily
- Frequency
- aufgeteilt auf 3 Dosen
- Route
- oral
- Duration
- 4 Wochen
- Timing
- With meals
- With food
- empfohlen
There is no officially established Tolerable Upper Intake Level (UL) for Tribulus terrestris in the EU or by the BfR. Clinical studies used doses up to 1500 mg/day. At higher doses, hepato- and nephrotoxic events are documented in case reports [s14, s15]. Intake duration beyond 12 weeks is not supported by safety data.
Efficacy is strongly dependent on the protodioscin content of the extract, which varies considerably by geographical origin and plant part [s3]. Products from Bulgaria (e.g., Tribestan) were used in most RCTs [s6]. At least 2 weeks of intake before onset of effect is common according to user experience [c2].
Side Effects
| Side Effect | Frequency | Severity |
|---|---|---|
| Gastrointestinale Beschwerden (Übelkeit, Magenschmerzen, Durchfall) Occasionally reported in clinical trials; well tolerated in most RCTs [s6, s1]. | gelegentlich | leicht |
| Schlaflosigkeit, Reizbarkeit, erhöhte Herzfrequenz Individual reports from clinical practice and case reports; mechanistically plausible via hormonal activation [s16]. | selten | leicht |
| Hepatotoxizität (Leberschädigung) Rare but documented case reports of elevated liver enzymes and acute hepatic injury following ingestion [s14, s15]. Causality not unequivocally established in all cases. | selten | schwer |
| Nephrotoxizität (Nierenschädigung) Case reports document renal damage, particularly at high doses or in individuals with pre-existing conditions [s14, s15]. | selten | schwer |
| Menstruationsstörungen bei Frauen Theoretically possible due to hormone-modulating properties of the extract; mentioned in individual reports [s16]. | selten | leicht |
Contraindications
Insufficient safety data; hormone-modulating effects potentially harmful to the fetus and neonate. Products carry corresponding warning labels [s16].
Documented hepato- and nephrotoxicity in case reports contraindicates use in the presence of existing organ damage [s14, s15].
Due to the postulated androgenic properties of protodioscin, there is a theoretical risk of stimulating hormone-sensitive tumors [s3, s4].
Tribulus terrestris may lower blood glucose; risk of hypoglycemia when combined with antidiabetic medications [s17].
Interactions
Synergistic
Additive vasodilation via NO mechanism theoretically possible; clinical data lacking; combination not recommended without medical supervision [s4].
Both plants show positive effects on sexual function and sperm parameters in animal studies. A combination could offer complementary aphrodisiac and antioxidant effects. However, clinical human studies on the combination are still lacking.
Zinc demonstrably contributes to the maintenance of normal testosterone levels and is frequently combined with tribulus. This combination is found in many commercial products. Zinc addresses a known micronutrient deficiency that can affect testosterone.
Fenugreek also contains protodioscin, the same active compound as tribulus. A combination could increase total saponin content but also carries the risk of overdose. Their combined use is known in traditional formulations.
Caution
Tribulus terrestris may lower blood glucose; additive effect increases hypoglycemia risk [s17].
Tribulus terrestris may lower blood pressure; additive antihypertensive effect possible [s17].
Tribulus may exert diuretic effects, thereby reducing lithium clearance and potentially leading to elevated lithium levels [s17].
Possible interactions due to the diuretic effect of Tribulus; electrolyte changes may influence glycoside toxicity [s17].
Tribulus may affect DHEA levels and is purported to stimulate the androgenic metabolic pathway. Combination with exogenous DHEA could lead to uncontrolled androgen levels. Hormone monitoring is advisable with concurrent use.
Both substances interfere with the HPG axis and may affect LH/FSH levels. Concurrent use without medical supervision can lead to uncontrolled hormonal effects. Clinical interaction data are lacking.
Gonadorelin directly stimulates the pituitary to release LH/FSH. Combination with Tribulus, which also targets LH release, could result in excessive HPG axis stimulation. Not recommended without medical supervision.
HCG mimics LH and directly stimulates Leydig cells to produce testosterone. Concurrent use of Tribulus may potentiate the androgenic effect and lead to hormonal imbalances. Medical supervision required.
Studies
Tier A — High Evidence
Outcome: Fertility and libido
Effect Size: Mild effects on testosterone, FSH, and LH; no consistent strong effect
Outcome: Erectile dysfunction and hypoactive sexual disorder in men (IIEF score)
Effect Size: No significant superiority of Tribestan vs. placebo on overall ED score
Outcome: Sexual function in women with HSDD of reproductive age (FSFI score)
Effect Size: Significant improvement in total FSFI score vs. placebo
Outcome: Sexual function in postmenopausal women (FSFI score)
Effect Size: Significant improvement in total FSFI score vs. placebo
Outcome: Erectile function (IIEF score) and testosterone levels in men
Effect Size: Weak evidence for improvement of erectile function; no robust evidence for testosterone increase in humans
Tier B — Moderate Evidence
Outcome: Muscle strength and body composition in rugby players
Effect Size: No significant difference vs. placebo in strength or body composition
Outcome: Body composition, hormonal response, CrossFit performance
Effect Size: No significant effect on testosterone or body composition
Outcome: Muscle damage and anaerobic performance in boxers
Effect Size: Reduced muscle damage; no effect on total muscle mass
Tier C — Low Evidence
Outcome: LH, FSH, testosterone following protodioscin administration
Effect Size: Elevation of hormone levels in animal model of castrated rats
Outcome: Testosterone, DHT, DHEA levels; NO release in corpus cavernosum
Effect Size: Significant increase in animal model; transferability to humans unclear
Community Evidence
Top reported benefits
- Subjectively increased libido (particularly short-term)
- Improved erectile quality in individual users
- Mildly increased energy and motivation during training
- Improved mood and general well-being
Top reported issues
- No noticeable effect in a subset of users
- Efficacy highly dependent on product and protodioscin content
- Gastrointestinal complaints at higher doses
- Effect observed only with alcohol abstinence and healthy lifestyle
Experienced community members note that clinical studies do not consistently demonstrate testosterone elevation in humans [c3, c5] and that the effect is likely mediated via nitric oxide rather than testosterone [c1]. Quality differences between products are substantial; Bulgarian extracts (Tribestan) are rated as more effective [c1, c2]. Doping-related concerns regarding potential contamination in some products are occasionally discussed [c4].
Scientific Sources
- Effects of Tribulus (Tribulus terrestris L.) Supplementation on Erectile Dysfunction and Testosterone Levels in Men—A Systematic Review of Clinical Trials
Vilar Neto JdO, de Moraes WMAM, Pinto DV, et al. (2025). NutrientsAPMID:40219032DOI - Tribulus terrestris extracts alleviate muscle damage and promote anaerobic performance of trained male boxers and its mechanisms: Roles of androgen, IGF-1, and IGF binding protein-3
Huang Y, Xu Y, Lin T, et al. (2018). Journal of Sport and Health ScienceADOI - The Effects of 6 Weeks of Tribulus terrestris L. Supplementation on Body Composition, Hormonal Response, Perceived Exertion, and CrossFit® Performance: A Randomized, Single-Blind, Placebo-Controlled Study
Fernandez-Lazaro D, Mielgo-Ayuso J, Seco-Calvo J, et al. (2021). NutrientsADOI - Risikobewertung von Pflanzen und pflanzlichen Zubereitungen — BfR-Liste
Bundesinstitut für Risikobewertung (BfR) (2023). Bundesinstitut für RisikobewertungALink - Assessment report on Tribulus terrestris L., herba
European Medicines Agency (EMA) (2018). EMA Committee on Herbal Medicinal Products (HMPC)ALink - Severe Liver and Renal Injury From Tribulus Terrestris
Larrey D, Vial T, Pauli A, et al. (2024). ACG Case Reports JournalCPMID:38328764DOI - Tribulus terrestris-induced severe nephrotoxicity in a young healthy male
Talasaz AH, Abbasi MR, Mousavi M (2010). Nephrology Dialysis TransplantationCPMID:20667992DOI - Tribulus — LiverTox: Clinical and Research Information on Drug-Induced Liver Injury
National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK) (2022). NCBI Bookshelf / NIH LiverToxBLink - Tribulus: Overview, Uses, Side Effects, Precautions, Interactions, Dosing and Reviews
WebMD Editorial Contributors (2024). WebMD Vitamins & SupplementsBLink - 2025 List of Prohibited Substances and Methods
World Anti-Doping Agency (WADA) (2025). CLink - The Profertility and Aphrodisiac Activities of Tribulus terrestris L.: Evidence from Meta-Analyses
Ara I, Bano S, Sultana V, et al. (2023). AndrologiaADOI - A Comprehensive Review of the Phytochemical, Pharmacological, and Toxicological Properties of Tribulus terrestris L.
Zhu W, Du Y, Meng H, et al. (2020). Evidence-Based Complementary and Alternative MedicineBDOI - Sexual Effects of Puncturevine (Tribulus terrestris) Extract (Protodioscin): An Evaluation Using a Rat Model
Gauthaman K, Adaikan PG, Prasad RN (2003). Journal of Alternative and Complementary MedicineCPMID:12614197DOI - Protodioscin increases the levels of luteinizing hormone, testosterone, dehydroepiandrosterone and dihydrotestosterone — animal studies
Gauthaman K, Adaikan PG, Prasad RN (2002). Life SciencesCLink - Evaluation of the efficacy and safety of Tribulus terrestris in male sexual dysfunction—A prospective, randomized, double-blind, placebo-controlled clinical trial
Kamenov Z, Fileva S, Kalinov K, et al. (2017). MaturitasAPMID:28364864DOI - Tribulus terrestris for treatment of sexual dysfunction in women: randomized double-blind placebo-controlled study
Postigo S, Lima SM, Yamada SS, et al. (2016). Revista Brasileira de Ginecologia e ObstetríciaAPMID:24773615DOI - Assessment of the Effects of Tribulus Terrestris on Sexual Function of Menopausal Women
Santos HO, Howell S, Teixeira FJ (2019). ClimactericAPMID:26902700DOI - The effect of five weeks of Tribulus terrestris supplementation on muscle strength and body composition during preseason training in elite rugby league players
Rogerson S, Riches CJ, Jennings C, et al. (2007). Journal of Strength and Conditioning ResearchAPMID:17530942DOI
Community Sources
Storage
Unopened
Store dry and cool at room temperature (15–25 °C), protected from direct sunlight and moisture.
Opened
Keep container tightly closed; avoid moisture for capsules and powders; consume within the indicated period after opening.
Notes
No special refrigeration requirements; store according to manufacturer instructions.